I have been reading Thomas Weber's book: 'Hitler's First War: Adolf Hitler, the Men of the List Regiment, and the First World War'.

It is interesting to find out that Hitler was never at a rank equivalent to a U.S. Army corporal during the First World War.
That depends on a mistranslation of the German term Gefreiter.
The correct translation for Gefreiter would be private first class.
Hitler had no line of command over anyone else during the First World War.